CN112657224B

CN112657224B - Styrene rectifying device capable of effectively reducing energy consumption of pre-separation tower

Info

Publication number: CN112657224B
Application number: CN202110056260.0A
Authority: CN
Inventors: 陶春风; 滕明才; 瞿滨; 蒋仲恺
Original assignee: Ningbo Keyuan Jinghua Co ltd
Current assignee: Ningbo Keyuan Jinghua Co ltd
Priority date: 2021-01-15
Filing date: 2021-01-15
Publication date: 2023-03-28
Anticipated expiration: 2041-01-15
Also published as: CN112657224A

Abstract

The invention discloses a styrene rectifying device capable of effectively reducing energy consumption of a pre-separation tower, which comprises the pre-separation tower, wherein a first supporting seat, a steam generator, an ethylbenzene dehydrogenation device, a second supporting seat, a first water supply pump, a second water supply pump, a third supporting seat, a third water supply pump and a fourth water supply pump are movably arranged on the right side of the pre-separation tower, a fourth heat insulation sleeve is fixedly arranged at the upper end of the first supporting seat, a preheating body is fixedly arranged on the inner wall of the fourth heat insulation sleeve, and a second steam inlet pipe is fixedly arranged on an air outlet port of the steam generator. This styrene rectifier unit of effectively reducing knockout tower energy consumption in advance through setting up preheating body and preheating tank, has realized the waste heat retrieval and utilization effect to ethylbenzene dehydrogenation device high temperature lime set, and is high to thermal utilization ratio, does benefit to and practices thrift manufacturing cost, through setting up second insulation cover and connecting pipe, realizes utilizing steam and high temperature lime set to carry out heat retaining effect to the preliminary treatment tower, and the thermal insulation efficiency is good, convenient to use.

Description

Styrene rectifying device capable of effectively reducing energy consumption of pre-separation tower

Technical Field

The invention relates to the technical field of styrene rectifying devices, in particular to a styrene rectifying device capable of effectively reducing energy consumption of a pre-separation tower.

Background

At present, the production process of domestic chemical enterprises is basically mature, the main work of each enterprise is put on the optimization adjustment of the process and the energy conservation and consumption reduction of the production of a device, the process of the device is slightly adjusted and changed through a series of optimization adjustment of the production process, so that the use amount of water, electricity, steam and the like is reduced, the production energy consumption of the device is reduced, a styrene rectifying device is a device with larger energy consumption in the process of producing finished styrene, mainly the consumption of steam, the feeding temperature is about 43 ℃, the heating amount required by a pre-separation tower is large, the corresponding energy consumption is large, most of process condensate of an ethylbenzene dehydrogenation device after steam stripping is cut into a circulating water field for use, the temperature of the process condensate is higher than about 75 ℃, the energy consumption of the circulating water field is increased, in order to reduce the energy consumption of the device, the feeding of the pre-separation tower and the process condensate of the rectifying device are subjected to heat exchange through the feeding of the pre-separation tower and the process condensate of the rectifying device, the feeding temperature of the pre-separation tower is increased, the heating amount of the pre-separation tower is reduced, and the temperature of the process condensate of the circulating water field is reduced finally.

In the styrene rectification process, the thermal loss is large, the energy consumption of a separation tower cannot be effectively reduced by the conventional styrene rectification device, a steam pipe of a pre-separation tower cannot be preheated, high-temperature condensate produced by an ethylbenzene dehydrogenation device cannot be utilized to preheat the steam pipe, the heat utilization rate is low, and therefore the styrene rectification device capable of effectively reducing the energy consumption of the pre-separation tower is provided.

Disclosure of Invention

The invention aims to provide a styrene rectifying device capable of effectively reducing energy consumption of a pre-separation tower, and aims to solve the problems that the conventional styrene rectifying device in the background art cannot effectively reduce energy consumption of the separation tower, cannot preheat a steam pipe of the pre-separation tower, cannot preheat the steam pipe by using high-temperature condensate produced by an ethylbenzene dehydrogenation device, and is low in heat utilization rate.

In order to achieve the purpose, the invention provides the following technical scheme: a styrene rectifying device capable of effectively reducing energy consumption of a pre-separation tower comprises the pre-separation tower, wherein a first supporting seat, a steam generator, an ethylbenzene dehydrogenation device, a second supporting seat, a first water supply pump, a second water supply pump, a third supporting seat, a third water supply pump and a fourth water supply pump are movably arranged on the right side of the pre-separation tower, a fourth heat insulation sleeve is fixedly arranged at the upper end of the first supporting seat, a preheating body is fixedly arranged on the inner wall of the fourth heat insulation sleeve, a second steam inlet pipe is fixedly arranged on an air outlet port of the steam generator, a first steam inlet is fixedly arranged at the right end of the pre-separation tower, a first heat insulation pipe is fixedly arranged at the right end of the first steam inlet, a first steam inlet pipe is fixedly arranged at the right end of the first heat insulation pipe, a connecting rod is fixedly arranged on the inner wall of the preheating body, and a preheating tank is fixedly arranged on the inner wall of the connecting rod, the right end of the first steam inlet pipe penetrates through the preheating tank and is connected with the left end of the second steam inlet pipe, a third condensate conveying pipe is fixedly mounted on a liquid outlet port of the ethylbenzene dehydrogenation device, a water inlet port of a third water supply pump is connected with the third condensate conveying pipe, a water inlet port of a fourth water supply pump is connected with the third condensate conveying pipe, a fourth condensate conveying pipe is fixedly mounted on a water outlet port of the third water supply pump, one end of the fourth condensate conveying pipe penetrates through the preheating body and the preheating tank and extends into the preheating tank, a first heat-preserving sleeve is fixedly mounted at the upper end of the second supporting seat, a heat-preserving tank is fixedly mounted on the inner wall of the first heat-preserving sleeve, a first liquid inlet pipe is fixedly mounted at the right end of the heat-preserving tank, a second electric valve is fixedly mounted on the first liquid inlet pipe, and a water outlet port of the first water supply pump is connected with the first liquid inlet pipe, third supporting seat upper end fixed mounting has the third insulation cover, third insulation cover inner wall fixed mounting has high temperature milipore filter device, high temperature milipore filter device right-hand member fixed mounting has the third waste liquid output tube, pre-separation tower outer wall fixed mounting has the second insulation cover.

Preferably, a first condensate conveying pipe is fixedly mounted on a liquid outlet port of the ethylbenzene dehydrogenation device, a first electric valve is fixedly arranged on the first condensate conveying pipe, and a water inlet port of the first water supply pump is connected with the first condensate conveying pipe.

Preferably, a first liquid outlet pipe is fixedly mounted at the left end of the heat preservation tank, a sixth electric valve is fixedly arranged on the first liquid outlet pipe, a condensate inlet is fixedly mounted at the right end of the second heat preservation sleeve, a second heat preservation pipe is fixedly mounted at the right end of the condensate inlet, a third electric valve is fixedly mounted on the second heat preservation pipe, and the rear end of the second heat preservation pipe is in through connection with the front end of the first liquid outlet pipe.

Preferably, a second condensate conveying pipe is fixedly mounted at the right end of the second heat preservation pipe, and the right end of the second condensate conveying pipe penetrates through the preheating tank and extends to the inside of the preheating tank.

Preferably, fixed mounting has first waste liquid output tube on the water inlet port of second working shaft, fixed mounting has the fourth motorised valve on the first waste liquid output tube, first waste liquid output tube upper end runs through the inside that the preheating tank extended to the preheating tank, fixed mounting has the second waste liquid output tube on the water outlet port of second working shaft, fixed mounting has the fifth motorised valve on the second waste liquid output tube, the second waste liquid output tube is connected with high temperature milipore filter device.

Preferably, a seventh electric valve and an eighth electric valve are fixedly mounted on the third condensate conveying pipe, and a ninth electric valve is fixedly mounted on the fourth condensate conveying pipe.

Preferably, a fifth condensate conveying pipe is fixedly mounted on a water outlet port of the fourth water supply pump, a tenth electrically operated valve is fixedly mounted on the fifth condensate conveying pipe, and the right end of the fifth condensate conveying pipe penetrates through the fourth condensate conveying pipe and extends into the fourth condensate conveying pipe.

Preferably, pre-separation tower outer wall fixed mounting has solid fixed ring, gu fixed ring is inside to be hollow structure, gu fixed ring lower extreme fixed mounting has evenly distributed's connecting pipe, the connecting pipe lower extreme runs through the inside that the second insulation cover extended to the second insulation cover, pre-separation tower right-hand member fixed mounting has steam outlet, steam outlet right-hand member fixed mounting has the steam output pipe, second insulation cover right-hand member fixed mounting has the second steam inlet port, steam output pipe lower extreme runs through inside the second steam inlet port extended to the connecting pipe.

Preferably, the inner walls of the upper end and the lower end of the preheating tank are fixedly provided with fixing frames, the fixing frames are fixedly provided with electric heating elements, and the inner walls of the left end and the right end of the preheating tank are fixedly provided with temperature sensors.

Preferably, the fourth insulation cover is internally hollow, and an asbestos layer and a rock wool layer are fixedly arranged in the wall layer of the fourth insulation cover.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the styrene rectifying device capable of effectively reducing the energy consumption of the pre-separation tower, the preheating body and the preheating tank are arranged, so that the waste heat recycling effect of the high-temperature condensate of the ethylbenzene dehydrogenation device is realized, the utilization rate of heat is high, the production cost is saved, the heat preservation effect of the pretreatment tower by utilizing steam and the high-temperature condensate is realized by arranging the second heat preservation sleeve and the connecting pipe, the heat preservation efficiency is good, and the use is convenient;

2. according to the styrene rectifying device capable of effectively reducing the energy consumption of the pre-separation tower, the third water supply pump and the fourth water supply pump are arranged, so that the effect that the third water supply pump and the fourth water supply pump can transport high-temperature condensate is achieved, the phenomenon that a single water supply pump works for a long time to damage an impeller of the water pump is effectively avoided, the protection effect on the third water supply pump and the fourth water supply pump is improved, and the styrene rectifying device is easy to use;

3. this styrene rectifier unit of effectively reducing separation tower energy consumption in advance through setting up second working shaft and high temperature milipore filter device, realizes having reduced waste water pollution to the filtration treatment effect of lime set waste water, does benefit to the environmental protection, through the setting that all is equipped with the motorised valve on each pipeline, rationally opens or closes the motorised valve and can realize the flow direction of quick change lime set, convenient to use.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic diagram of the internal cross-sectional structure of the preheating body according to the present invention;

FIG. 3 is a schematic view of a connecting tube according to the present invention;

FIG. 4 is a schematic view of a partially enlarged electrothermal element according to the present invention;

FIG. 5 is a schematic view showing the construction of a third water supply pump and a fourth water supply pump according to the present invention;

FIG. 6 is a schematic view of the internal cross-section of a fourth insulating sheath according to the present invention.

In the figure: 1. a pre-separation column; 2. a first support base; 3. a steam generator; 4. an ethylbenzene dehydrogenation unit; 5. a first steam inlet port; 6. a first heat-insulating tube; 7. a first steam inlet pipe; 8. a preheating body; 9. a second steam inlet pipe; 10. a first condensate conveying pipe; 11. a second support seat; 12. a first heat preservation sleeve; 13. a heat preservation tank; 14. a first liquid inlet pipe; 15. a first water supply pump; 16. a first electrically operated valve; 17. a second electrically operated valve; 18. a first liquid outlet pipe; 19. a fixing ring; 20. a connecting pipe; 21. a second insulating sleeve; 22. a steam outlet; 23. a steam output pipe; 24. a second steam inlet port; 25. a condensate inlet; 26. a second insulating tube; 27. a third electrically operated valve; 28. a second condensate conveying pipe; 29. a first waste liquid output pipe; 30. a second water supply pump; 31. a second waste liquid output pipe; 32. a third support seat; 33. a third insulating sleeve; 34. a high-temperature ultrafiltration membrane device; 35. a third waste liquid output pipe; 36. a fourth electrically operated valve; 37. a fifth electrically operated valve; 38. a sixth electrically operated valve; 39. a third condensate conveying pipe; 40. a seventh electrically operated valve; 41. an eighth electrically operated valve; 42. a third water supply pump; 43. a fourth condensate conveying pipe; 44. a ninth electrically operated valve; 45. a fourth water supply pump; 46. a fifth condensate conveying pipe; 47. a tenth electrically operated valve; 48. a fourth insulating sleeve; 49. a preheating tank; 50. a fixed mount; 51. an electric heating element; 52. a temperature sensor; 53. a connecting rod; 54. an asbestos layer; 55. rock wool layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides a technical solution: a styrene rectifying device capable of effectively reducing energy consumption of a pre-separation tower comprises the pre-separation tower 1, a first supporting seat 2, a steam generator 3, an ethylbenzene dehydrogenation device 4, a second supporting seat 11, a first water supply pump 15, a second water supply pump 30, a third supporting seat 32, a third water supply pump 42 and a fourth water supply pump 45 are movably arranged on the right side of the pre-separation tower 1, a fourth heat insulation sleeve 48 is fixedly arranged at the upper end of the first supporting seat 2, a preheating body 8 is fixedly arranged on the inner wall of the fourth heat insulation sleeve 48, a second steam inlet pipe 9 is fixedly arranged on an air outlet port of the steam generator 3, a first steam inlet 5 is fixedly arranged at the right end of the pre-separation tower 1, a first heat preservation pipe 6 is fixedly arranged at the right end of the first steam inlet 5, a first steam inlet pipe 7 is fixedly arranged at the right end of the first heat preservation pipe 6, a connecting rod 53 is fixedly arranged on the inner wall of the preheating body 8, the inner wall fixed mounting of connecting rod 53 has a preheater 49, the 7 right-hand members of first steam admission pipe run through the preheater 49 and are connected with the 9 left ends of second steam admission pipe, fixed mounting has third condensate conveyer pipe 39 on the play liquid port of ethylbenzene dehydrogenation device 4, the inlet port of third feed pump 42 is connected with third condensate conveyer pipe 39, the inlet port of fourth feed pump 45 is connected with third condensate conveyer pipe 39, fixed mounting has fourth condensate conveyer pipe 43 on the outlet port of third feed pump 42, fourth condensate conveyer pipe 43 one end is run through inside preheater 8 and preheater 49 extend to preheater 49, 11 upper ends fixed mounting of second supporting seat has first heat preservation cover 12, 12 inner walls fixed mounting of first heat preservation cover has a heat preservation tank 13, 13 right-hand members fixed mounting of heat preservation tank 13 has first feed liquor pipe 14, fixed mounting has second motorised valve 17 on the first feed liquor pipe 14, the play water port of first working shaft 15 is connected with first feed liquor pipe 14, third supporting seat 32 upper end fixed mounting has third insulation cover 33, 33 inner walls fixed mounting of third insulation cover has high temperature milipore filter device 34, 34 right-hand member fixed mounting of high temperature milipore filter device has third waste liquid output tube 35, 1 outer wall fixed mounting of pre-separation tower has second insulation cover 21.

Further, fixed mounting has first condensate conveyer pipe 10 on the play liquid port of ethylbenzene dehydrogenation device 4, fixed being provided with first motorised valve 16 on the first condensate conveyer pipe 10, the inlet port of first feed pump 15 is connected with first condensate conveyer pipe 10, and the setting of first motorised valve 16 does benefit to control rivers direction, convenient to use.

Further, the left end fixed mounting of holding vessel 13 has first drain pipe 18, the fixed sixth motorised valve 38 that is provided with on the

first drain pipe

18, 21 right-hand members fixed mounting of second insulation cover have the lime set inlet port 25, lime set inlet port 25 right-hand member fixed mounting has second insulating tube 26, fixed mounting has third motorised valve 27 on the second insulating tube 26, second insulating tube 26 rear end and the mutual through connection of first drain pipe 18 front end have realized carrying the heat preservation of lime set, do benefit to the utilization of waste heat.

Further, second lime set conveyer pipe 28 is fixedly mounted at the right end of second insulating tube 26, and second lime set conveyer pipe 28 right end runs through the inside that preheating tank 49 extended to preheating tank 49, has realized the waste heat utilization of lime set, has reduced the energy consumption.

Further, fixed mounting has first waste liquid output tube 29 on the water inlet port of second working shaft 30, fixed mounting has fourth motorised valve 36 on the first waste liquid output tube 29, the inside that preheating tank 49 extended to preheating tank 49 is run through to first waste liquid output tube 29 upper end, fixed mounting has second waste liquid output tube 31 on the water outlet port of second working shaft 30, fixed mounting has fifth motorised valve 37 on the second waste liquid output tube 31, second waste liquid output tube 31 is connected with high temperature milipore filter device 34, has realized utilizing high temperature milipore filter device 34 to the filtration of lime set, has reduced the pollution degree of waste water, does benefit to the environmental protection.

Furthermore, a seventh electric valve 40 and an eighth electric valve 41 are fixedly mounted on the third condensate conveying pipe 39, and a ninth electric valve 44 is fixedly mounted on the fourth condensate conveying pipe 43, so that the effect that the third water supply pump 42 and the fourth water supply pump 45 can be used interchangeably is realized, the overheating and burning of the water pumps is avoided, and the protection effect on the third water supply pump 42 and the fourth water supply pump 45 is improved.

Further, fixed mounting has a fifth condensate conveyer pipe 46 on the delivery port of fourth feed pump 45, fixed mounting has a tenth motorised valve 47 on the fifth condensate conveyer pipe 46, fifth condensate conveyer pipe 46 right-hand member runs through in fourth condensate conveyer pipe 43 extends to fourth condensate conveyer pipe 43, does benefit to the quick change condensate flow direction, convenient to use.

Further, 1 outer wall fixed mounting of preseparation tower has solid fixed ring 19, gu 19 inside hollow structure that is of fixed ring, gu 19 lower extreme fixed mounting of fixed ring has evenly distributed's connecting pipe 20, the inside that second insulation cover 21 extends to second insulation cover 21 is run through to the 20 lower extremes of connecting pipe, 1 right-hand member fixed mounting of preseparation tower has steam outlet 22, steam outlet 22 right-hand member fixed mounting has

steam output pipe

23, 21 right-hand member fixed mounting of second insulation cover has second steam inlet 24, steam output pipe 23 lower extreme runs through inside second steam inlet 24 extends to connecting pipe 20, has realized utilizing steam heat preservation preseparation tower 1's effect.

Further, the inner walls of the upper end and the lower end of the preheating tank 49 are fixedly provided with a fixing frame 50, the fixing frame 50 is fixedly provided with an electric heating element 51, the inner walls of the left end and the right end of the preheating tank 49 are fixedly provided with a temperature sensor 52, the effect of heating the preheating tank 49 through the electric heating element 51 is realized, and the use is convenient.

Further, the inside hollow structure that is of fourth insulation cover 48, the wall layer internal fixation of fourth insulation cover 48 is provided with asbestos layer 54 and rock wool layer 55, and the setting of fourth insulation cover 48 has strengthened the heat preservation effect to preheating tank 49.

The working principle is as follows: firstly, a steam generator 3 is started to send steam into a first steam inlet pipe 7 through a second steam inlet pipe 9, finally the steam enters a pre-separation tower 1 through a first heat preservation pipe 6, the steam is finally output from a steam output pipe 23 and enters a connecting pipe 20, the heat preservation effect on the pre-separation tower 1 is realized, high-temperature condensate generated by an ethylbenzene dehydrogenation device 4 enters a heat preservation tank 13 through a first condensate conveying pipe 10, then enters a second heat preservation pipe 26 from a first liquid outlet pipe 18, and finally enters the connecting pipe 20 from a condensate inlet 25, the heat preservation effect on the pre-separation tower 1 is realized, the high-temperature condensate of the ethylbenzene dehydrogenation device 4 can also enter a preheating tank 49 in a preheating body 8 through a third water supply pump 42 and a fourth water supply pump 45, the first steam inlet pipe 7 and the second steam inlet pipe 9 are preheated, the preheating effect on the steam can be realized, the utilization rate of waste heat is improved, and the condensate finally enters a high-temperature ultrafiltration membrane device 34 through a second water supply pump 30 and is filtered and then discharged.

Finally, it should be noted that the above-mentioned contents are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, and that the simple modifications or equivalent substitutions of the technical solutions of the present invention by those of ordinary skill in the art can be made without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. The utility model provides an effectively reduce styrene rectifier unit of preseparator energy consumption, includes preseparator (1), its characterized in that: the right side of the pre-separation tower (1) is movably provided with a first support seat (2), a steam generator (3), an ethylbenzene dehydrogenation device (4), a second support seat (11), a first water supply pump (15), a second water supply pump (30), a third support seat (32), a third water supply pump (42) and a fourth water supply pump (45), the upper end of the first support seat (2) is fixedly provided with a fourth heat insulation sleeve (48), the inner wall of the fourth heat insulation sleeve (48) is fixedly provided with a preheating body (8), the gas outlet port of the steam generator (3) is fixedly provided with a second steam inlet pipe (9), the right end of the pre-separation tower (1) is fixedly provided with a first steam inlet (5), the right end of the first steam inlet (5) is fixedly provided with a first heat insulation pipe (6), the right end of the first heat insulation pipe (6) is fixedly provided with a first steam inlet pipe (7), the inner wall of the preheating body (8) is fixedly provided with a connecting rod (53), the inner wall of the connecting rod (53) is fixedly provided with a preheating tank (49), the preheating pipe (7) penetrates through the second steam inlet tank (49) and the third condensate liquid inlet pipe (39) is connected with the left end of the ethylbenzene condensate delivery pipe (39), the inlet port of fourth working shaft (45) is connected with third lime set conveyer pipe (39), fixed mounting has fourth lime set conveyer pipe (43) on the outlet port of third working shaft (42), fourth lime set conveyer pipe (43) one end runs through preheating body (8) and preheating tank (49) and extends to inside preheating tank (49), second supporting seat (11) upper end fixed mounting has first protecting heat cover (12), first protecting heat cover (12) inner wall fixed mounting has heat preservation jar (13), heat preservation jar (13) right-hand member fixed mounting has first feed liquor pipe (14), fixed mounting has second motorised valve (17) on first feed liquor pipe (14), the outlet port of first working shaft (15) is connected with first feed liquor pipe (14), third supporting seat (32) upper end fixed mounting has third insulating cover (33), third insulating cover (33) inner wall fixed mounting has high temperature unit (34), high temperature unit (34) right-hand member fixed mounting has second three wastes output tube (35) in advance, separate from second insulating tower (21) outer wall.

2. The styrene rectification plant for effectively reducing the energy consumption of a pre-separation column according to claim 1, which is characterized in that: a first condensate delivery pipe (10) is fixedly mounted on a liquid outlet port of the ethylbenzene dehydrogenation device (4), a first electric valve (16) is fixedly arranged on the first condensate delivery pipe (10), and a water inlet port of a first water supply pump (15) is connected with the first condensate delivery pipe (10).

3. The styrene rectification plant for effectively reducing the energy consumption of a pre-separation column according to claim 1, which is characterized in that: insulating pot (13) left end fixed mounting has first drain pipe (18), the fixed sixth motorised valve (38) that is provided with on first drain pipe (18), second insulation cover (21) right-hand member fixed mounting has condensate inlet port (25), condensate inlet port (25) right-hand member fixed mounting has second insulating tube (26), fixed mounting has third motorised valve (27) on second insulating tube (26), second insulating tube (26) rear end and first drain pipe (18) front end are link up each other and are connected.

4. The styrene rectification plant for effectively reducing the energy consumption of the pre-separation column according to claim 3, which is characterized in that: and a second condensate conveying pipe (28) is fixedly mounted at the right end of the second heat preservation pipe (26), and the right end of the second condensate conveying pipe (28) penetrates through the preheating tank (49) and extends to the inside of the preheating tank (49).

5. The styrene rectification device for effectively reducing the energy consumption of the pre-separation tower as claimed in claim 1, is characterized in that: fixed mounting has first waste liquid output tube (29) on the port of intaking of second working shaft (30), fixed mounting has fourth motorised valve (36) on first waste liquid output tube (29), the inside that preheating tank (49) extended to preheating tank (49) is run through to first waste liquid output tube (29) upper end, fixed mounting has second waste liquid output tube (31) on the port of the play water of second working shaft (30), fixed mounting has fifth motorised valve (37) on second waste liquid output tube (31), second waste liquid output tube (31) are connected with high temperature milipore filter device (34).

6. The styrene rectification plant for effectively reducing the energy consumption of a pre-separation column according to claim 1, which is characterized in that: a seventh electric valve (40) and an eighth electric valve (41) are fixedly arranged on the third condensate conveying pipe (39), and a ninth electric valve (44) is fixedly arranged on the fourth condensate conveying pipe (43).

7. The styrene rectification plant for effectively reducing the energy consumption of a pre-separation column according to claim 1, which is characterized in that: the last fixed mounting of the water outlet port of fourth feed pump (45) has fifth condensate conveyer pipe (46), fixed mounting has tenth motorised valve (47) on fifth condensate conveyer pipe (46), fifth condensate conveyer pipe (46) right-hand member runs through fourth condensate conveyer pipe (43) and extends to in fourth condensate conveyer pipe (43).

8. The styrene rectification device for effectively reducing the energy consumption of the pre-separation tower as claimed in claim 1, is characterized in that: pre-separation tower (1) outer wall fixed mounting has solid fixed ring (19), gu fixed ring (19) inside is hollow structure, gu fixed ring (19) lower extreme fixed mounting has evenly distributed's connecting pipe (20), connecting pipe (20) lower extreme runs through the inside that second insulation cover (21) extended to second insulation cover (21), pre-separation tower (1) right-hand member fixed mounting has steam outlet (22), steam outlet (22) right-hand member fixed mounting has steam output pipe (23), second insulation cover (21) right-hand member fixed mounting has second steam inlet (24), steam output pipe (23) lower extreme runs through second steam inlet (24) and extends to connecting pipe (20) inside.

9. The styrene rectification plant for effectively reducing the energy consumption of a pre-separation column according to claim 1, which is characterized in that: inner walls of the upper end and the lower end of the preheating tank (49) are fixedly provided with a fixing frame (50), an electric heating element (51) is fixedly arranged on the fixing frame (50), and inner walls of the left end and the right end of the preheating tank (49) are fixedly provided with temperature sensors (52).

10. The styrene rectification plant for effectively reducing the energy consumption of a pre-separation column according to claim 1, which is characterized in that: the fourth heat preservation cover (48) is internally hollow, and an asbestos layer (54) and an asbestos layer (55) are fixedly arranged in the wall layer of the fourth heat preservation cover (48).